Troubleshooting; General Guidelines; Solving Problems Based On Symptoms; Symptom: The Unit Is Not Heating As Expected - Daikin Altherma ERLQ004CAV3 Installer's Reference Manual

12 Troubleshooting
12

Troubleshooting

12.1
General guidelines
Before starting the troubleshooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
WARNING
▪ When carrying out an inspection on the switch box of
the unit, always make sure that the unit is disconnected
from the mains. Turn off the respective circuit breaker.
▪ When a safety device was activated, stop the unit and
find out why the safety device was activated before
resetting it. NEVER bridge safety devices or change
their values to a value other than the factory default
setting. If you are unable to find the cause of the
problem, call your dealer.
DANGER: RISK OF ELECTROCUTION
WARNING
Prevent hazard due to the inadvertent resetting of the
thermal cut­out: this appliance must NOT be supplied
through an external switching device, such as a timer, or
connected to a circuit that is regularly turned ON and OFF
by the utility.
DANGER: RISK OF BURNING
Installer reference guide
66
12.2
Solving problems based on
symptoms
12.2.1
Symptom: The unit is NOT heating as
expected
Possible causes
The temperature setting is NOT
correct
The water flow is too low
The water volume in the
installation is too low
12.2.2
Symptom: The compressor does NOT
start (space heating or domestic water
heating)
Possible causes
The unit must start up out of its
operation range (the water
temperature is too low)
ERLQ004~008CA + EHVH04+08S18CA3VF
Corrective action
Check the temperature setting on
the remote controller. Refer to
the operation manual.
Check and make sure that:
▪ All shut­off valves of the water
circuit are completely open.
▪ The water filter is clean. Clean
if necessary.
▪ There is no air in the system.
Purge air if necessary. You
can purge air manually (see
"9.3.1 To perform a manual air
purge" on page 61) or use the
automatic air purge function
(see "9.3.2 To perform an
automatic air purge" on page
62).
▪ The water pressure is >1 bar.
▪ The expansion vessel is NOT
broken.
▪ The resistance in the water
circuit is NOT too high for the
pump (see "15.7 ESP
curve" on page 98).
If the problem persists after you
have conducted all of the above
checks, contact your dealer. In
some cases, it is normal that the
unit decides to use a low water
flow.
Make sure that the water volume
in the installation is above the
minimum required value (see
"6.3.3 To check the water
volume" on page 22).
Corrective action
If the water temperature is too
low, the unit uses the backup
heater to reach the minimum
water temperature first (15°C).
Check and make sure that:
▪ The power supply to the
backup heater is correctly
wired.
▪ The backup heater thermal
protector is NOT activated.
▪ The backup heater contactors
are NOT broken.
If the problem persists after you
have conducted all of the above
checks, contact your dealer.
Daikin Altherma low temperature split
4P366226­1 – 2014.01